Once the device’s IP address changes, though, it will go away. If you’ve used a network scanning utility before iOS 11, manufacturer data may still appear. This restriction also means you’ll eventually stop seeing manufacturer information in network scanning apps. Since devices frequently change IP addresses, this takes away an enormous layer of usefulness for most network scanning apps, including Fing, Network Analyzer, and others. Legitimate network scanners can no longer read MAC addresses, which means all administrators can go by now are IP addresses. What Does This Mean for Legitimate Network Scanners? I won’t say whom, but I think we can all guess. A MAC address is unique to one particular device, and certain apps were using that information to track users. Thanks to developers misusing that information, apps can’t use the ARP table to view MAC addresses on iOS 11 anymore.
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